There were 14 games longer than 100 moves, 3 games longer than 150 moves. The
longest game was 197 moves (game 6,
draw).

Time per game (hours)

Median= 3:52
Average= 3:52

Openings

There
were variable length book openings in this stage chosen by Jeroen. The first letter of the
ECO codes was
distributed as follows:

If we use the opening 'family name' (using format FAMILY_NAME: VARIANT....) the top 3 are:
Sicilian - 14 times
King's Indian - 10 times

French - 8 times

The
engines had little freedom to choose the opening variant, depending on the length of the book sequence. In fact
all but one of the game pairs repeated the same ECO code and opening
variant twice. Games 97-98 were two King's Indian variants that differed on move 10, with ECO codes E98 and E99.

Reverse pairs, wins

There were no openings with a 2-0 result, and only one opening with a biased 1-1 result (games 85-86, Old Indian, Tartakower (Wade) variation).

Reverse pairs, same moves

Pairs of reverse games diverged very quickly, 68% of the pairs
diverged at most after 1 move. The longest repeated move sequence in a
game pair was 18 plys long (games 37-38, QGA, Linares variation, two draws).